我必须在图像视图中捕获的图像中心绘制圆并保存在db中。首先捕获图像并裁剪图像，并在图像的中心绘制圆圈，并在图像视图中显示并保存在DB中。圆圈不是绘制的。我尝试了很多方法。请帮助我。
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:baselineAligned="false"
tools:context=".MainActivity"
android:weightSum="1">
<Button
android:id="@+id/btn_select_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:text="Select Image" />
<LinearLayout
android:layout_width="226dp"
android:layout_height="231dp"
android:orientation="vertical"
android:weightSum="1">
<ImageView
android:id="@+id/img_photo"
android:layout_width="200dp"
android:layout_height="500dp"
android:layout_marginTop="10dp"
android:scaleType="fitXY"
android:layout_weight="0.45" />
</LinearLayout>
<LinearLayout
android:layout_width="280dp"
android:layout_height="77dp"
android:gravity="center_vertical|center_horizontal"
android:orientation="horizontal">
<TextView
android:id="@+id/xPos"
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_weight="0.32"
android:gravity="left|center_vertical"
android:padding="5dip"
android:visibility="invisible" />
<TextView
android:id="@+id/yPos"
android:layout_width="5dp"
android:layout_height="wrap_content"
android:layout_weight="0.32"
android:gravity="right|center_vertical"
android:padding="5dip"
android:visibility="invisible" />
</LinearLayout>
</LinearLayout>
mainActivity.java
package knuckle.app.com.knuckleauthentication;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Point;
import android.net.Uri;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import knuckle.app.com.knuckleauthentication.R;
import static android.R.attr.bitmap;
import static android.R.attr.color;
import static android.R.attr.path;
import static android.provider.MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE;
import android.content.Context;
import android.view.ViewGroup.LayoutParams;
public class MainActivity extends AppCompatActivity {
private final static int REQUEST_PERMISSION_REQ_CODE = 34;
private static final int CAMERA_CODE = 101, GALLERY_CODE = 201, CROPING_CODE = 301;
public static final int MEDIA_TYPE_IMAGE = 1;
// directory name to store captured images and videos
private static final String IMAGE_DIRECTORY_NAME = "Knuckle Images";
private Button btn_select_image;
private TextView txt_x_pos, txt_y_pos;
private ImageView imageView;
private Uri mImageCaptureUri;
private File outPutFile = null;
private DataHelper dbHelper;
FrameLayout preview = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHelper=new DataHelper(this);
outPutFile = new File(Environment.getExternalStorageDirectory(), "temp.jpg");
txt_x_pos = (TextView) findViewById(R.id.xPos);
txt_y_pos = (TextView) findViewById(R.id.yPos);
btn_select_image = (Button) findViewById(R.id.btn_select_image);
imageView = (ImageView) findViewById(R.id.img_photo);
btn_select_image.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
selectImageOption();
}
});
}
private void selectImageOption() {
final CharSequence[] items = { "Capture Photo", "Choose from Gallery", "Cancel" };
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Add Photo!");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Capture Photo")) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp1.jpg");
mImageCaptureUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
startActivityForResult(intent, CAMERA_CODE);
} else if (items[item].equals("Choose from Gallery")) {
Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, GALLERY_CODE);
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
@Override
protected void onResume() {
super.onResume();
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION_REQ_CODE);
return;
}
}
@Override
public void onRequestPermissionsResult(final int requestCode, final @NonNull String[] permissions, final @NonNull int[] grantResults) {
switch (requestCode) {
case REQUEST_PERMISSION_REQ_CODE: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Permission granted.", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "Permission denied.", Toast.LENGTH_SHORT).show();
}
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLERY_CODE && resultCode == RESULT_OK && null != data) {
mImageCaptureUri = data.getData();
System.out.println("Gallery Image URI : "+mImageCaptureUri);
CropingIMG();
} else if (requestCode == CAMERA_CODE && resultCode == Activity.RESULT_OK) {
System.out.println("Camera Image URI : "+mImageCaptureUri);
CropingIMG();
} else if (requestCode == CROPING_CODE) {
try {
if(outPutFile.exists()){
Bitmap photo = decodeFile(outPutFile);
imageView.setImageBitmap(photo);
/* BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inDither = true;
bfo.inScaled = false;
bfo.inPreferredConfig = Bitmap.Config.ARGB_8888;
bfo.inPurgeable = true;
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.id.img_photo, bfo);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setStrokeWidth(10);
paint.setColor(Color.RED);
Bitmap workingBitmap = Bitmap.createBitmap(bm);
Bitmap mutuableBitmap = workingBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutuableBitmap);
canvas.drawCircle(60, 50, 15, paint);
imageView.setAdjustViewBounds(true);
imageView.setImageBitmap(mutuableBitmap);*/
//
// preview.addView(imageView);
// Display display = getWindowManager().getDefaultDisplay();
//Point size = new Point(photo.getHeight()/2, photo.getWidth()/2);
//display.getSize(size);
// int screenCenterX = (size.x/2);
//int screenCenterY = (size.y/2) ;
//DrawOnTop mDraw = new DrawOnTop(this,screenCenterX,screenCenterY);
//addContentView(mDraw, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
// txt_x_pos.setText(screenCenterX);
// txt_y_pos.setText(screenCenterY);
createBitMap();
dbHelper.insertBitmap(photo);
Toast.makeText(getApplicationContext(),
"Knuckle Image Saved successfully.",
Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getApplicationContext(), "Error while save image", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void createBitMap() {
Bitmap bitMap = BitmapFactory.decodeResource(null, R.id.img_photo); //creates bmp
bitMap = bitMap.copy(bitMap.getConfig(), true); //lets bmp to be mutable
Canvas canvas = new Canvas(bitMap); //draw a canvas in defined bmp
Paint paint = new Paint(); //define paint and paint color
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
paint.setStrokeWidth(15);
paint.setAntiAlias(true); //smooth edges
Display display = getWindowManager().getDefaultDisplay();
int centerX = display.getWidth()/2;
int centerY = display.getHeight()/2;
float canvasX = (float) canvas.getWidth();
float canvasY = (float) canvas.getHeight();
float bitmapX = (float) bitMap.getWidth();
float bitmapY = (float) bitMap.getHeight();
float boardPosX = ((canvasX/2) - (bitmapX/2));
float boardPosY = ((canvasY /2)- (bitmapY/2));
canvas.drawBitmap(bitMap, boardPosX, boardPosY, paint);
canvas.drawCircle(centerX, centerY, 3, paint);
imageView.setImageBitmap(bitMap);
}
private void CropingIMG() {
final ArrayList<CropingOption> cropOptions = new ArrayList<CropingOption>();
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setType("image/*");
List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );
int size = list.size();
if (size == 0) {
Toast.makeText(this, "Cann't find image croping app", Toast.LENGTH_SHORT).show();
return;
} else {
intent.setData(mImageCaptureUri);
intent.putExtra("outputX", 512);
intent.putExtra("outputY", 512);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
//TODO: don't use return-data tag because it's not return large image data and crash not given any message
//intent.putExtra("return-data", true);
//Create output file here
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(outPutFile));
if (size == 1) {
Intent i = new Intent(intent);
ResolveInfo res = (ResolveInfo) list.get(0);
i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
startActivityForResult(i, CROPING_CODE);
} else {
for (ResolveInfo res : list) {
final CropingOption co = new CropingOption();
co.title = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
co.icon = getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
co.appIntent= new Intent(intent);
co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
cropOptions.add(co);
}
CropingOptionAdapter adapter = new CropingOptionAdapter(getApplicationContext(), cropOptions);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose Croping App");
builder.setCancelable(false);
builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
public void onClick( DialogInterface dialog, int item ) {
startActivityForResult( cropOptions.get(item).appIntent, CROPING_CODE);
}
});
builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
@Override
public void onCancel( DialogInterface dialog ) {
if (mImageCaptureUri != null ) {
getContentResolver().delete(mImageCaptureUri, null, null );
mImageCaptureUri = null;
}
}
} );
AlertDialog alert = builder.create();
alert.show();
}
}
}
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 512;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
}
return null;
}
/**
* ------------ Helper Methods ----------------------
* */
/**
* Creating file uri to store image/video
*/
public Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(type));
}
/**
* returning image / video
*/
private static File getOutputMediaFile(int type) {
// External sdcard location
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
IMAGE_DIRECTORY_NAME);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
+ IMAGE_DIRECTORY_NAME + " directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "IMG_" + timeStamp + ".jpg");
} else {
return null;
}
return mediaFile;
}
}
class DrawOnTop extends View {
int screenCenterX = 0;
int screenCenterY = 0;
final int radius = 15;
public DrawOnTop(Context context, int screenCenterX, int screenCenterY) {
super(context);
this.screenCenterX = screenCenterX;
this.screenCenterY = screenCenterY;
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
Paint p = new Paint();
p.setColor(Color.RED);
DashPathEffect dashPath = new DashPathEffect(new float[]{5,5}, (float)1.0);
p.setPathEffect(dashPath);
p.setStyle(Paint.Style.STROKE);
canvas.drawCircle(screenCenterX, screenCenterY, radius, p);
invalidate();
super.onDraw(canvas);
}
}
chroppingoption.java
package knuckle.app.com.knuckleauthentication; import android.content.Intent; import android.graphics.drawable.Drawable; /** * Created by DP on 7/12/2016. */ public class CropingOption { public CharSequence title; public Drawable icon; public Intent appIntent; }
croppingoptionadapter.java
package knuckle.app.com.knuckleauthentication;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import knuckle.app.com.knuckleauthentication.R;
import android.support.v7.app.AppCompatActivity;
public class CropingOptionAdapter extends ArrayAdapter {
private ArrayList mOptions;
private LayoutInflater mInflater;
public CropingOptionAdapter(Context context, ArrayList options) {
super(context, R.layout.croping_selector, options);
mOptions = options;
mInflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup group) {
if (convertView == null)
convertView = mInflater.inflate(R.layout.croping_selector, null);
CropingOption item = (CropingOption) mOptions.get(position);
if (item != null) {
((ImageView) convertView.findViewById(R.id.img_icon)).setImageDrawable(item.icon);
((TextView) convertView.findViewById(R.id.txt_name)).setText(item.title);
return convertView;
}
return null;
}
}
datahelper.java
package knuckle.app.com.knuckleauthentication;
import java.io.ByteArrayOutputStream;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
public class DataHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "knuckledb";
public static final String TABLE_NAME = "tbl_knuckle_img";
public static final int DATABASE_VERSION = 1;
public static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(id INTEGER PRIMARY KEY AUTOINCREMENT, img BLOB NOT NULL, description TEXT NULL)";
public static final String DELETE_TABLE = "DROP TABLE IF EXISTS " + TABLE_NAME;
public DataHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
// Create the table
db.execSQL(CREATE_TABLE);
}
//Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//Drop older table if existed
db.execSQL(DELETE_TABLE);
//Create tables again
onCreate(db);
}
public void insertBitmap(Bitmap bm) {
// Convert the image into byte array
ByteArrayOutputStream out = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, out);
byte[] buffer = out.toByteArray();
// Open the database for writing
SQLiteDatabase db = this.getWritableDatabase();
// Start the transaction.
db.beginTransaction();
ContentValues values;
int width=bm.getWidth();
int height=bm.getHeight();
int centerX=width/2;
int centerY=height/2;
try {
values = new ContentValues();
values.put("img", buffer);
values.put("description", "knuckle image");
values.put("centerX", centerX);
values.put("centerY", centerY);
// Insert Row
long i = db.insert(TABLE_NAME, null, values);
Log.i("Insert", i + "");
// Insert into database successfully.
db.setTransactionSuccessful();
} catch (SQLiteException e) {
e.printStackTrace();
} finally {
db.endTransaction();
// End the transaction.
db.close();
// Close database
}
}
public Bitmap getBitmap(int id) {
Bitmap bitmap = null;
// Open the database for reading
SQLiteDatabase db = this.getReadableDatabase();
// Start the transaction.
db.beginTransaction();
try {
String selectQuery = "SELECT * FROM " + TABLE_NAME + " WHERE id = " + id;
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.getCount() > 0) {
while (cursor.moveToNext()) {
// Convert blob data to byte array
byte[] blob = cursor.getBlob(cursor.getColumnIndex("img"));
// Convert the byte array to Bitmap
bitmap = BitmapFactory.decodeByteArray(blob, 0, blob.length);
}
}
db.setTransactionSuccessful();
} catch (SQLiteException e) {
e.printStackTrace();
} finally {
db.endTransaction();
// End the transaction.
db.close();
// Close database
}
return bitmap;
}
}
您想要像在此链接中的绘制图像
[绘制圆形图像] https://github.com/youssefshaaban/show-now-round-image-image-from-webservice
您可以在应用中使用file roundedimageview.java，并在XML布局中使用它而不是ImageView